Murry’s appearance at SXSW was limited to a 30-minute show in a club away from the downtown madness. But he delivered a few of his emotional, heartfelt songs between expressions of misgiving for even being in Austin for what he thinks is an overcommercialized, anti-artistic exercise. Murry’s upcoming album, “The Graceless Age,” might make such self-promotion unnecessary. Its raw, powerful lyrics and Springsteen-like cinematic sweep already are generating raves in the United Kingdom, where it’s been out for a few months.